# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Ci::BuildTraceChunks::Redis, :clean_gitlab_redis_shared_state do
  let(:data_store) { described_class.new }

  describe '#data' do
    subject { data_store.data(model) }

    context 'when data exists' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: 'sample data in redis') }

      it 'returns the data' do
        is_expected.to eq('sample data in redis')
      end
    end

    context 'when data does not exist' do
      let(:model) { create(:ci_build_trace_chunk, :redis_without_data) }

      it 'returns nil' do
        is_expected.to be_nil
      end
    end
  end

  describe '#set_data' do
    subject { data_store.set_data(model, data) }

    let(:data) { 'abc123' }

    context 'when data exists' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: 'sample data in redis') }

      it 'overwrites data' do
        expect(data_store.data(model)).to eq('sample data in redis')

        subject

        expect(data_store.data(model)).to eq('abc123')
      end
    end

    context 'when data does not exist' do
      let(:model) { create(:ci_build_trace_chunk, :redis_without_data) }

      it 'sets new data' do
        expect(data_store.data(model)).to be_nil

        subject

        expect(data_store.data(model)).to eq('abc123')
      end
    end
  end

  describe '#append_data' do
    context 'when valid offset is used with existing data' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: 'abcd') }

      it 'appends data' do
        expect(data_store.data(model)).to eq('abcd')

        length = data_store.append_data(model, '12345', 4)

        expect(length).to eq 9
        expect(data_store.data(model)).to eq('abcd12345')
      end
    end

    context 'when data does not exist yet' do
      let(:model) { create(:ci_build_trace_chunk, :redis_without_data) }

      it 'sets new data' do
        expect(data_store.data(model)).to be_nil

        length = data_store.append_data(model, 'abc', 0)

        expect(length).to eq 3
        expect(data_store.data(model)).to eq('abc')
      end
    end

    context 'when data needs to be truncated' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: '12345678') }

      it 'appends data and truncates stored value' do
        expect(data_store.data(model)).to eq('12345678')

        length = data_store.append_data(model, 'ab', 4)

        expect(length).to eq 6
        expect(data_store.data(model)).to eq('1234ab')
      end
    end

    context 'when invalid offset is provided' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: 'abc') }

      it 'raises an exception' do
        length = data_store.append_data(model, '12345', 4)

        expect(length).to be_negative
      end
    end

    context 'when trace contains multi-byte UTF8 characters' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: 'aüc') }

      it 'appends data' do
        length = data_store.append_data(model, '1234', 4)

        data_store.data(model).then do |new_data|
          expect(new_data.bytesize).to eq 8
          expect(new_data).to eq 'aüc1234'
        end

        expect(length).to eq 8
      end
    end

    context 'when trace contains non-UTF8 characters' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: "a\255c") }

      it 'appends data' do
        length = data_store.append_data(model, '1234', 3)

        data_store.data(model).then do |new_data|
          expect(new_data.bytesize).to eq 7
        end

        expect(length).to eq 7
      end
    end
  end

  describe '#delete_data' do
    subject { data_store.delete_data(model) }

    context 'when data exists' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: 'sample data in redis') }

      it 'deletes data' do
        expect(data_store.data(model)).to eq('sample data in redis')

        subject

        expect(data_store.data(model)).to be_nil
      end
    end

    context 'when data does not exist' do
      let(:model) { create(:ci_build_trace_chunk, :redis_without_data) }

      it 'does nothing' do
        expect(data_store.data(model)).to be_nil

        subject

        expect(data_store.data(model)).to be_nil
      end
    end
  end

  describe '#size' do
    context 'when data exists' do
      let(:model) { create(:ci_build_trace_chunk, :redis_with_data, initial_data: 'üabcd') }

      it 'returns data bytesize correctly' do
        expect(data_store.size(model)).to eq 6
      end
    end

    context 'when data does not exist' do
      let(:model) { create(:ci_build_trace_chunk, :redis_without_data) }

      it 'returns zero' do
        expect(data_store.size(model)).to be_zero
      end
    end
  end

  describe '#keys' do
    subject { data_store.keys(relation) }

    let(:build) { create(:ci_build) }
    let(:relation) { build.trace_chunks }

    before do
      create(:ci_build_trace_chunk, :redis_with_data, chunk_index: 0, build: build)
      create(:ci_build_trace_chunk, :redis_with_data, chunk_index: 1, build: build)
    end

    it 'returns keys' do
      is_expected.to eq([[build.id, 0], [build.id, 1]])
    end
  end

  describe '#delete_keys' do
    subject { data_store.delete_keys(keys) }

    let(:build) { create(:ci_build) }
    let(:relation) { build.trace_chunks }
    let(:keys) { data_store.keys(relation) }

    before do
      create(:ci_build_trace_chunk, :redis_with_data, chunk_index: 0, build: build)
      create(:ci_build_trace_chunk, :redis_with_data, chunk_index: 1, build: build)
    end

    it 'deletes multiple data' do
      Gitlab::Redis::SharedState.with do |redis|
        expect(redis.exists?("gitlab:ci:trace:#{build.id}:chunks:0")).to eq(true)
        expect(redis.exists?("gitlab:ci:trace:#{build.id}:chunks:1")).to eq(true)
      end

      subject

      Gitlab::Redis::SharedState.with do |redis|
        expect(redis.exists?("gitlab:ci:trace:#{build.id}:chunks:0")).to eq(false)
        expect(redis.exists?("gitlab:ci:trace:#{build.id}:chunks:1")).to eq(false)
      end
    end
  end
end
